What does Mao Feng (毛峰) mean?

Such as Keemun Mao Feng, Huang Shan Mao Feng, Jiu Hua Mao Feng, etc.? I've heard mention that it refers to the grade of tea, but that doesn't seem right, as I believe that China follows a numerical tea grading system, with each recognized style having a ranked grading system (Grade 1, 2, 3, etc.) based on characteristics particular to its style... Is this incorrect? Another option I've heard of is that Mao Feng refers to the cultivar used. That is, that all Mao Feng teas use the Mao Feng tea cultivar, but are grown in different areas and processed in different ways. That sounds a bit suspect as well...

As Chip said, Huang Shan is name of the region, and is where the most famous Mao Feng is produced. Mao Feng describes the tea. Most Chinese tea names have two parts, the first part the region, and the second part descriptive. But sometimes both parts are descriptive. In Jiu Hua Mao Feng, "Jiu Hua" refers to Jiu Hua Mountain. But if a tea is called Jasmine Mao Feng or Mao Feng Snow Flakes, then Jasmine or "snow flakes" refers to the flower used to scent the tea.

Mao Feng is only part of a tea name. It refers to a tea made in a similar method as in Huang Shan Mao Feng. But there are exceptions. Keemun Mao Feng is a red tea named with Mao Feng. It looks more similar to green tea Mao Feng than many other red teas, but it looks quite differently from green tea Mao Feng.